C if else

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If else of C Programming tutorial

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C if else

  1. 1. C if elseIntroduction:-The if statement is used to conditionally execute a statement or ablock of statements. Conditions can be true or false, execute onething when the condition is true, something else when thecondition is false.
  2. 2. C if elseSyntax:- if (expression) statement(s); [else statement(s);]
  3. 3. C if elseExample :- if (a == b) printf ("%d is equal to %d", a, b); else printf ("%d is not equal to %d", a, b);
  4. 4. C if elseIf-then statements :-Syntax:- if (expression) statement(s);
  5. 5. C if elseIf-then statements :-Example:- if (a == b) printf ("%d is equal to %d", a, b); else printf ("%d is not equal to %d", a, b);Note : There is no indentation rule in writing C programming, we can write the abovecode in following ways :
  6. 6. C if elseIf-then statements :-Example:- if (a == b) printf ("if a is equal to b"); printf ("%d is equal to %d", a, b); if (a == b) { printf ("if a is equal to b"); printf ("%d is equal to %d", a, b); }Note : The second way of writing code is a good practice.
  7. 7. C if elseA complete example on conditional if-else statement:-Example :- #include<stdio.h> main() { int num; printf("Input a number : "); scanf("%d",&num); if(num>0) { printf("This is a positive integern"); } else // else portion of if statement { printf(" This is not a positive integer..Try againn") ; } }
  8. 8. C if elseA complete example on conditional if-else statement:-Example :- #include<stdio.h> main() { int num; printf("Input a number : "); scanf("%d",&num); if(num>0) { printf("This is a positive integern"); } else // else portion of if statement { printf(" This is not a positive integer..Try againn") ; } }
  9. 9. C if elseSequential if-then statements :-Example :- if (a == b) printf ("a = b"); if (a == c) printf ("a = c"); if (b == c) printf ("b = c")
  10. 10. C if elseMultiway if-else-Statement :-syntax :- if (expression_1) statement_1 else if (expression_2) statement_2 . . . else if (expression_n) statement_n else other_statement
  11. 11. C if elseMultiway if-else-Statement :- #include<stdio.h> main()Example :- { int num; printf("Input score :"); scanf("%d",&num); if (num>=90) { printf("Grade : Excellent"); } else if(num>=80 && num<90) { printf("Grade : Very Good"); } else if(num>=60 && num<80) { printf("Grade : Good"); } else if(num>=50 && num<60) { printf("Grade : Average"); } else if(num>=40 && num<50) { printf("Grade : Poor"); } else { printf("Grade : Not Promoted"); } }
  12. 12. C if elseNested if-then-else statements :-Example :- #include<stdio.h> main() { int num1=5, num2=3, num3=-12, min; if(num1<num2) { if(num1<num3) min = num1; else min = num3; } else { if(num2<num3) min = num2; else min = num3; } printf("Among %d, %d, %d minimum number is %d",num1 ,num2,num3,min); }

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